The RFA is a flotilla of 13 naval support ships that delivers afloat support to UK and Allied armed forces around the world.

Owned by the Ministry of Defence, it is manned by British civilian sailors who are trained to operate alongside the Royal Navy.

The bust happened on February 11 after the Wave Knight detected the speedboat operating in the area off the coast of Jamaica they were patrolling.

It was the first embarkation of an armed US Coast Guard Dolphin helicopter to a non-US military platform, the Ministry of Defence said.

Mark Francois, Minister of State for the Armed Forces, said: "I am delighted that the men and women of the Royal Fleet Auxiliary have once again provided vital assistance to the international counter-narcotics mission in the Caribbean.

"I'd like to thank them for their hard work throughout their deployment which has already led to millions of pounds worth of illegal drugs being taken off our streets."